[inuyasha]

Hi
Welcome aboard
Pleased to met you
Do one modification at a time if you do too many at once and problems arise it will be hard to figure out the problems if too many things where changed at the same time
On jetting the 120 may be a little large and your not bound to get it with the first jet size out try to ,get a few different sizes. As you won't know until you mod an part try a size and see if its the right one to get a proper air/fuel mix
The 26 km carb is as little large as well try a 22 or 24 mm instead
With the 61 mm piston you will half to crack the case and their will be some machine work that will need to be done boring out the cylinder etc,, largest you can go with out the extra workn is 59 mm
If you go with the performance variator and cam better get a performance clutch and crankshaft as well to handle the added power
Also be pr prepared to rebuild the engine on a regular basis and that it may not be as reliable as a stock engine over time
Best of luck with the upgrades
Take care and ride safely
Yours Hank